Getting less events

Asked by Sarif Khan on 2021-02-22

Hi,

I am trying to generate the following process for SM,

define vl = ve vm vt ve~ vm~ vt~
generate e+ e- > e+ e- z, (z > vl vl)

I am generating 50k events. After showering when I demand two electrons in the final state at the Delphes I get around 32k events.

I have checked both at the Pythia 6 and Pythia 8, also decays in the auto mode and no cut.

It will be a great help if you kindly point out the mistake or missing something.

Best regards,
Sarif Khan

Question information

Language:
English Edit question
Status:
Solved
For:
MadGraph5_aMC@NLO Edit question
Assignee:
No assignee Edit question
Solved by:
Sarif Khan
Solved:
2021-02-22
Last query:
2021-02-22
Last reply:
2021-02-22

Hi,

I guess that they are no mistake.
Delphes applied cuts due to the acceptance of the Dectetor (acceptance, threshold, isolation,..)
which explains that you do not see all the events generated in previous steps.
Now I'm not an expert (no even a frequent user) of Delphes and you might want to contact them if you want more precise information.

Cheers,

Olivier

PS: Obviously for such type of collision, you need to use the appropriate parametrization of the Detector and in particular not use the default card which are targetting on LHC type of detector.
> On 22 Feb 2021, at 12:41, Sarif Khan <email address hidden> wrote:
>
> New question #695691 on MadGraph5_aMC@NLO:
> https://answers.launchpad.net/mg5amcnlo/+question/695691
>
> Hi,
>
> I am trying to generate the following process for SM,
>
> define vl = ve vm vt ve~ vm~ vt~
> generate e+ e- > e+ e- z, (z > vl vl)
>
> I am generating 50k events. After showering when I demand two electrons in the final state at the Delphes I get around 32k events.
>
> I have checked both at the Pythia 6 and Pythia 8, also decays in the auto mode and no cut.
>
> It will be a great help if you kindly point out the mistake or missing something.
>
> Best regards,
> Sarif Khan
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Sarif Khan (sarifkhan) said : #2

Hi Olivier,

Thanks a lot for the quick response. Okay, then this is related to the isolation cut which is being used at the Delphes detector card.
If I demand one electron then I get around 50k events. I think now I understand.

Thanks and best regards,
Sarif Khan